Grinding-mill.



R. F. ABB.

GRINDING MILL. f

APPLICATION FILED OGT.29.1910.

997,592. Patented July 11,1911.

2 SHEETS-SHEET l.

R. P. ABB. GRINDING MILL.

I APPLICATION FILED 0GT.29.1910. 9g'7592. Patented July 11,1911.

2 SHEETS-SHEET Z.

L iff@ No? new /1 RICHARD r. ABBE', or NEW YORK, N. Y.

GRINn'ING-MILL.

Specification of Letters Eatent.

Patented J 1115r 11, 1911.

Application led October 29, 1910. i Serial No. 589,780.

To all whom it may comerm,

Be it knownthat I, RICHARD F. ABB, a

citizen ofthe United States, residing in the city of New York, borough .of Brooklyn, in the count-y of Kings and State of New York, have invented certain new and useful vImprovements in Grinding-Mills, of' which the following is a specication.

This invention relates to grinding mills, and more especially to that type which is intended to pulverize moist or sticky substances, such as crude or unreiined sugar and other substances bysubjecting them tothe grinding yaction of horizontal disks superposed one above the other on a vertical shaft; and having radial beaters, said disks being surrounded by a casing having a stepshaped interior grinding surface; and for this purpose the invent-ion consists of a grinding mill which comprises an exterior casing, an interior step-shaped ygrinding shell, means for supplying the substances to be pulverized, a vertical driving-shaft, horizontal disks mounted on said shaft and provided with radialbeaters, located at the circumference of the disks and working in conjunction with the riiiled interior grinding shell `of the casing, the upper disks having openings, while the lowermost disk is imperforate, as will be fully described hereinafter and finally pointed out in the claims.

In the accompanymg drawings, Figure l representsa side-elevation of my improved grinding mill for pulverizing moist or Sticky substances; Fig. 2 is a vertical central 'section drawn on a larger scale; and Figs.

3 and 5 are plan-Views of the second lowest and of the' lowermost grinding disks, and Figs. 4 and 6 are respectively a vertical transverse sect-ion on line 4, 4, Fig 3, and a side-view of Fig. 5.' v v Similar lettersof referencefindicate corresponding parts throughout the several figures.

Referring to the drawings, c represents the casing of my improved grinding mill for moist or sticky substances. The casing is closed all around and is provided at the interior with a rifiled, step-shaped grinding shell b, the steps in the same enlarging in diameter from the upper toward the lower end. The. substances to be pulverized in the grinding mill are conducted by means of a vconveyer c from a hopper or trunk to the supply-opening o in the top-plate of the casing, as shown in Fig. 1.`

i At the center of the casing c is supported 1n suitable neck and step-bearings' a, a a verticaldisk-carrying shaft s, the neck-bearing being supportedon the top-plate of the casing, while the step-bearing is at' tached to the bottom-plate of the casing, both bearings being provided with suitable lubricating devices for oiling the journalsof the shafts. Thelower end of the' vertical shaft s is supported on a hard wood disk l and, the latter on a steel disk d', which disks are capable of vertical adjustment so as to take up the wear by means Iof an adjusting screw d2, which passes through the bottom of the lower step-bearing of the shaft. The lubricating devices are connected with suitable oil-chambers` in the bearings in the usual manner. y

The shaft s is rotated by means of a power-driven pulley p, a belt p" and a pulley 192 on the shaft s', said pulleyp being located above the step-bearing in a chamber -of the casing 0, formed by horizontal plates o2, c3, as shown in Fig 2,' said driving-belt being keptin stretched position by means of an idler-pulley p3, which is supported by a fork p4 that is'pivoted to a supporting plate attached to the lower part ofthe casing c.

' On the shaft s are mounted horizontal disks e, the hubs e of which are keyed to the shaft, said hubs being connected by vertical rods e2, the diameter ofthe disks corresponding' with the diameter of the stepshaped grinding shell. The upper portion of the grinding lshell is concentric with the upper disks and the lower largerlportions concentricwith the lower disks. To the circumference of the disks e are riveted or otherwise att-ached ,radial beaters e3, which are rotated in close proximity with the inner ritiied surface of the y,grinding shell, sol

that the material to be pulverized and which is fed through' the feed-opening of the topplate into the casing, isconducted by centrifugal action toward the circumference of p the disks and then through the narrow spaces between t-he'upper edges of the beaters and the inner grinding surface of the. shell. The `upper quickly-rotatingl disks e are .provided with a number of Ventilating openings 0 in their webs, with the exception of the lowermost disk, so that the air drawn in by the rotary motion of the disks, permits `the free movement'of the materialto be pulverized toward the circumference of the disks without being retarded or clogged. VAs

the lowermost disk is not provided with airsupply openings, the material dropping on the same is finally passed through vbetween the outer edges of the beaters and the inner ritiled portions of the grinding shell. The rapid rotary motion of the disks sucks in the air and secures the quick and uniform passage of the material to be pulverized through the mill and its discharge through the bottom of the casing to a passage f, from which it is dropped to a conveyer or supporting hopper below. The material to be pulverized, being successively acted on by the beaters and the interior .grinding surface of the casing, is delivered in finely-ground condition to the open lower part of the grinding mill, as indicated by arrows in Fig. 2. The air sucked in by the beaters serves for cooling the substances to be pulverized, so that the same are finally delivered in pulverized condition to the discharge-channel'at the bottoni of the casing. The disks and their beaters can be readily removed from the grinding mill for-being replaced when worn-out, the upper portion of the casing being removable by loosening the connecting bolts between the upper and lower portions.

The grinding mill is adapted for grinding crude or unretined sugar, licorice, gelatin and similar moist or sticky substances which'have to be pulverized in dry state in a quick and/ reliable manner.

Having thus described my invention, I claim as new and desire to secure by Letters Patent l. A grinding mill, comprising an exterior closed casing, an interior ritiled grinding` shell in said casing, a vertical shaft supported by step and neck-bearings in the casing, means for supplying the material to be pulverized, and a plurality of disks provided with radial beaters at their circumferences, mounted on said shaft, the upper series of disks excepting the lowerinost disk being provided with suction-openings.

2. A grinding mill, comprising a closed exterior casing, means for supplying material to be ground to the upper part of the casing, an interior step-shaped grinding shell attached to the casing, a vertical shaft journaled in neck and step-bearings in said casing, means for imparting a rotary motion to said shaft, and a plurality of horizontal disks, mounted on said shaft, radial beaters attached to the circumference of the disks, said disks having gradually increasing diameters corresponding to the steps ot' the grinding shell, the upperseries of disks, with the exception of the lower disk being provided with air suction-openings for preventing the clogging of the material to be pulverized by said disks.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing Witnesses.

RICHARD F. ABB.

Vitnesses:

PAUL GOEPEL, JOHN MURTAGH. 

